baby not as active

alyassa

i’m 21 weeks and 4 days and my baby hasn’t been as active as she usually is since yesterday . at my anatomy scan she was perfectly healthy . im a first time mom , so idk if this is a bad sign or what . she will kick a little but then stop . could it be from me accidentally rolling on my back at night ? could it hurt her ? someone help !!? i just love feeling her move so it’s freaking me out .